/usr/share/doc/libplplot12/examples/c++/x19.cc is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: x19.cc 12532 2013-09-26 15:18:37Z andrewross $
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Copyright (C) 2004 Andrew Ross
// Copyright (C) 2004 Alan W. Irwin
//
// This file is part of PLplot.
//
// PLplot is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// PLplot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with PLplot; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Implementation of PLplot example 19 in C++.
//--------------------------------------------------------------------------
#include "plc++demos.h"
#ifdef PL_USE_NAMESPACE
using namespace std;
#endif
class x19 {
public:
x19( int, const char ** );
private:
// Class data
plstream *pls;
};
void
map_transform( PLFLT x, PLFLT y, PLFLT *xt, PLFLT *yt, PLPointer /* data */ )
{
double radius;
radius = 90.0 - y;
*xt = radius * cos( x * M_PI / 180.0 );
*yt = radius * sin( x * M_PI / 180.0 );
}
//--------------------------------------------------------------------------
// mapform19
//
// Defines specific coordinate transformation for example 19.
// Not to be confused with mapform in src/plmap.c.
// x[], y[] are the coordinates to be plotted.
//--------------------------------------------------------------------------
void
mapform19( PLINT n, PLFLT *x, PLFLT *y )
{
int i;
double xp, yp, radius;
for ( i = 0; i < n; i++ )
{
radius = 90.0 - y[i];
xp = radius * cos( x[i] * M_PI / 180.0 );
yp = radius * sin( x[i] * M_PI / 180.0 );
x[i] = xp;
y[i] = yp;
}
}
// "Normalize" longitude values so that they always fall between -180.0 and
// 180.0
PLFLT
normalize_longitude( PLFLT lon )
{
PLFLT times;
if ( lon >= -180.0 && lon <= 180.0 )
{
return ( lon );
}
else
{
times = floor( ( fabs( lon ) + 180.0 ) / 360.0 );
if ( lon < 0.0 )
{
return ( lon + 360.0 * times );
}
else
{
return ( lon - 360.0 * times );
}
}
}
// A custom axis labeling function for longitudes and latitudes.
void
geolocation_labeler( PLINT axis, PLFLT value, char *label, PLINT length, PLPointer /* data */ )
{
const char *direction_label = "";
PLFLT label_val = 0.0;
if ( axis == PL_Y_AXIS )
{
label_val = value;
if ( label_val > 0.0 )
{
direction_label = " N";
}
else if ( label_val < 0.0 )
{
direction_label = " S";
}
else
{
direction_label = "Eq";
}
}
else if ( axis == PL_X_AXIS )
{
label_val = normalize_longitude( value );
if ( label_val > 0.0 )
{
direction_label = " E";
}
else if ( label_val < 0.0 )
{
direction_label = " W";
}
else
{
direction_label = "";
}
}
if ( axis == PL_Y_AXIS && value == 0.0 )
{
// A special case for the equator
snprintf( label, length, "%s", direction_label );
}
else
{
snprintf( label, length, "%.0f%s", fabs( label_val ), direction_label );
}
}
x19::x19( int argc, const char ** argv )
{
PLFLT minx, maxx, miny, maxy;
// plplot initialization
pls = new plstream();
// Parse and process command line arguments.
pls->parseopts( &argc, argv, PL_PARSE_FULL );
// Longitude (x) and latitude (y)
miny = -70;
maxy = 80;
// Initialize PLplot.
pls->init();
// Cartesian plots
// Most of world
minx = -170;
maxx = minx + 360;
// Setup a custom latitude and longitude-based scaling function.
pls->slabelfunc( geolocation_labeler, NULL );
pls->col0( 1 );
pls->env( minx, maxx, miny, maxy, 1, 70 );
pls->map( NULL, "usaglobe", minx, maxx, miny, maxy );
// The Americas
minx = 190;
maxx = 340;
pls->col0( 1 );
pls->env( minx, maxx, miny, maxy, 1, 70 );
pls->map( NULL, "usaglobe", minx, maxx, miny, maxy );
// Clear the labeling function
pls->slabelfunc( NULL, NULL );
// Polar, Northern hemisphere
minx = 0;
maxx = 360;
pls->env( -75., 75., -75., 75., 1, -1 );
pls->map( mapform19, "globe", minx, maxx, miny, maxy );
pls->lsty( 2 );
pls->meridians( mapform19, 10.0, 10.0, 0.0, 360.0, -10.0, 80.0 );
// Polar, Northern hemisphere, this time with a PLplot-wide transform
minx = 0;
maxx = 360;
pls->stransform( map_transform, NULL );
pls->lsty( 1 );
pls->env( -75., 75., -75., 75., 1, -1 );
// No need to set the map transform here as the global transform will be
// used.
pls->map( NULL, "globe", minx, maxx, miny, maxy );
pls->lsty( 2 );
pls->meridians( NULL, 10.0, 10.0, 0.0, 360.0, -10.0, 80.0 );
// Show Baltimore, MD on the map
pls->col0( 2 );
pls->ssym( 0.0, 2.0 );
PLFLT x = -76.6125;
PLFLT y = 39.2902778;
pls->poin( 1, &x, &y, 18 );
pls->ssym( 0.0, 1.0 );
pls->ptex( -76.6125, 43.0, 0.0, 0.0, 0.0, "Baltimore, MD" );
// For C, this is how the global transform is cleared
pls->stransform( NULL, NULL );
delete pls;
}
int main( int argc, const char ** argv )
{
x19 *x = new x19( argc, argv );
delete x;
}
//--------------------------------------------------------------------------
// End of x19.cc
//--------------------------------------------------------------------------
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